I'm buying a '96 600 XLT and I was wondering how to add some horsepower. I've been looking at doing something to the exhaust and intake (reeds or jetting). Thunderproducts.com has a Dial-a-jet but I don't know if that will tear up the engine and if its worth the money. Snowmobile-accesories.com has a silencer that they say would add a couple horses and shave ten pounds. If anyone could shed some light on this for me it would be great. I also want to find out all the specs on this sled: type of clutch, weight,compression ratios, etc. so I know what to deal with. If you know any good technical web sites devoted to snowmobiling that would be great. I like tinkering with engines to make them run good.